Zoology of graviton non-Gaussianities. Issue 12 (1st December 2021)

• Record Type: Journal Article
• Authors: Cabass, Giovanni
• Is Part Of: Journal of cosmology and astroparticle physics. Volume 2021:Issue 12(2021)
• Publication Date: 2021-12-01
• Subjects: inflation -- physics of the early universe; Cosmology -- Periodicals; Astrophysics -- Periodicals; 523.0105
• DOI: 10.1088/1475-7516/2021/12/001
• Languages: English
• ISSNs: 1475-7516

Abstract

Abstract: We characterize graviton non-Gaussianities in models of inflation where de Sitter boosts are spontaneously broken. We discuss which of the symmetry breaking patterns studied in Nicolis et al., 2015 [1] can sustain a period of quasi de Sitter expansion, and show that the symmetry breaking pattern of Solid Inflation allows the most freedom for graviton interactions. We comment on the phenomenological consequences of some of these interactions. As a byproduct of this analysis we construct the "EFT of Solid Inflation", which has all the useful features of the EFT of Inflation but for the case of broken spatial diffeomorphisms.